/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.hive;

import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.io.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class TsFileDeserializer {
    private static final Logger LOG = LoggerFactory.getLogger(TsFileDeserializer.class);
    private static final String ERROR_MSG = "Unexpected data type: %s for Date TypeInfo: %s";
    private List<Object> row;

    /**
     * Deserialize an TsFile record, recursing into its component fields and deserializing them as
     * well. Fields of the record are matched by name against fields in the Hive row.
     *
     * <p>Because TsFile has some data types that Hive does not, these are converted during
     * deserialization to types Hive will work with.
     *
     * @param columnNames List of columns Hive is expecting from record.
     * @param columnTypes List of column types matched by index to names
     * @param writable    Instance of MapWritable to deserialize
     * @param deviceId    device name
     * @return A list of objects suitable for Hive to work with further
     * @throws TsFileSerDeException For any exception during deserialization
     */
    @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity warning
    public Object deserialize(
            List<String> columnNames, List<TypeInfo> columnTypes, Writable writable, String deviceId)
            throws TsFileSerDeException {
        if (!(writable instanceof MapWritable)) {
            throw new TsFileSerDeException("Expecting a MapWritable");
        }

        if (row == null || row.size() != columnNames.size()) {
            row = new ArrayList<>(columnNames.size());
        } else {
            row.clear();
        }
        MapWritable mapWritable = (MapWritable) writable;
        if (!Objects.equals(mapWritable.get(new Text("device_id")).toString(), deviceId)) {
            return null;
        }

        LOG.debug("device_id: {}", mapWritable.get(new Text("device_id")));
        LOG.debug("time_stamp: {}", mapWritable.get(new Text("time_stamp")));

        for (int i = 0; i < columnNames.size(); i++) {
            TypeInfo columnType = columnTypes.get(i);
            String columnName = columnNames.get(i);
            Writable data = mapWritable.get(new Text(columnName));
            if (data == null || data instanceof NullWritable) {
                row.add(null);
                continue;
            }
            if (columnType.getCategory() != ObjectInspector.Category.PRIMITIVE) {
                throw new TsFileSerDeException("Unknown TypeInfo: " + columnType.getCategory());
            }
            PrimitiveObjectInspector.PrimitiveCategory type =
                    ((PrimitiveTypeInfo) columnType).getPrimitiveCategory();
            switch (type) {
                case BOOLEAN:
                    if (data instanceof BooleanWritable) {
                        row.add(((BooleanWritable) data).get());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }

                    break;
                case INT:
                    if (data instanceof IntWritable) {
                        row.add(((IntWritable) data).get());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                case LONG:
                    if (data instanceof LongWritable) {
                        row.add(((LongWritable) data).get());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                case FLOAT:
                    if (data instanceof FloatWritable) {
                        row.add(((FloatWritable) data).get());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                case DOUBLE:
                    if (data instanceof DoubleWritable) {
                        row.add(((DoubleWritable) data).get());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                case STRING:
                    if (data instanceof Text) {
                        row.add(data.toString());
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                case TIMESTAMP:
                    if (data instanceof LongWritable) {
                        row.add(new Timestamp(((LongWritable) data).get()));
                    } else {
                        throw new TsFileSerDeException(
                                String.format(ERROR_MSG, data.getClass().getName(), type));
                    }
                    break;
                default:
                    throw new TsFileSerDeException("Unknown TypeInfo: " + columnType.getCategory());
            }
        }
        return row;
    }
}
